Not sure if this bug has been found yet but:
If you have a scientist leading a science project AND then create a geology team with that lead scientist, you get a 0-unknown value in the science window and your scientist researches nothing.
I'm not sure if this is a bug or if there is suppose to be a warning message when creating the geological team.
VERSION 5. 60
Another bug, this time to do with tractor beams and OHs. If the OH has multiple ships in it, and only one ship is tractored, the tractored ship joins the tug group. If another tug is added to the tug group, it can still attempt to tractor the other OH in the original OH group, even if they are millions of km away.
Also, not really a bug but if your tug-OH results in too low of a speed, you will never be able to get the ships to a planet, nor will you be able to release the OH where it is. It only allows you to release ships at a destination.